Low temperature sintering and microwave dielectric properties of Li2ZnSiO4 ceramics with ZB glass

The influence of zinc borate (ZB) glass on densification, phase composition, microstructure and microwave dielectric properties of Li 2 ZnSiO 4 ceramics has been investigated by using X-ray diffraction, scanning electron microscopy and Advantest network analyzer. Undoped Li 2 ZnSiO 4 ceramics exhibited good microwave dielectric properties of ε r = 5.8, Q × f = 14,700 GHz and τ f = −96.6 ppm/°C. When ZB glass was added, the sintering temperature of Li 2 ZnSiO 4 ceramics was effectively reduced to 950 °C. Addition of 25.wt% ZB glass to Li 2 ZnSiO 4 ceramics sintered at 950 °C showed excellent dielectric properties of ε r = 5.5, Q × f = 10,800 GHz ( f = 6.8 GHz) and τ f = −47.2 ppm/°C. Moreover, the material was compatible with Ag electrodes, making it a very promising candidate material for LTCC applications.